Bob's the winner!  First on crash page.  He claims, while doing a loop the plane quit responding to the transmitter.  He refuses to take credit for this mishap.  His story, "I passed the transmitter to a fellow pilot while it was still 10 feet from the ground, not my fault!"

UPDATE:

 

Bob sent his transmitter to Horizon Hobby.  They determined there was a malfunction in the transmitter.  However, they could not determine "WHEN" the damage happened.